President Obama has tried really hard to stay out of the 2016 race for his job, except when it comes to one person: Wisconsin Republican Gov. Scott Walker.

First, Obama ripped Walker last month for signing into law a right-to-work bill. Then, in an interview with NPR published Tuesday, the president said Walker needed to "bone up on foreign policy" after suggesting he would undo any nuclear pact with Iran were he to win control of the White House.

Yet, the White House insists that Obama isn't going out of his way to rip Walker.

"It's nothing personal," White House press secretary Josh Earnest said, when asked if Obama had anything against Walker.

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